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Dispositif amorçable introuvable

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Francois56 -  
Lulu69 Posted messages 4321 Registration date   Status Membre Last intervention   -
Hello,

I installed Ubuntu alongside Windows Vista on an old PC. It worked fine until I modified the partitions to keep only the one for Ubuntu (thus deleting Windows Vista).

Since then, I have the blocking message "No bootable device".

Have I messed everything up or is there a way to recover the situation?

Thank you in advance for your help.

François

6 réponses

Réponse 1 / 6
Lulu69 Posted messages 4321 Registration date   Status Membre Last intervention   741
 
Hello,

Yes, you can reinstall grub by following this very simple method

https://lecrabeinfo.net/reparer-restaurer-ou-reinstaller-grub-quand-linux-ne-demarre-plus.html#reparer-restaurer-ou-reinstaller-grub

--
Secure, save, hold, protect, master.
95% of computer problems are located between the keyboard and the chair.
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Réponse 2 / 6
Francois56
 
Thank you, I will take a look at that calmly tomorrow because I don't have exactly the same screens as on the link. Thank you for the promptness!
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Lulu69 Posted messages 4321 Registration date   Status Membre Last intervention   741
 
No worries, you'll see it's very simple and relatively quick to do.

Good luck.
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Réponse 3 / 6
jns55
 
Hello,
Let's first check the state of the disk partitions:
Boot a live session from your Ubuntu installation media, open the terminal, and provide the result of the following command (copy/paste) 
sudo fdisk -l
(letter L)
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Réponse 4 / 6
Francois56
 
Hello,
Here is what I get when executing the command (I hope it's not too catastrophic..., thanks for the help!):

lubuntu@lubuntu:~$ sudo fdisk -l
Disk /dev/loop0: 1.59 GiB, 1697615872 bytes, 3315656 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/sda: 232.91 GiB, 250059350016 bytes, 488397168 sectors
Disk model: WDC WD2500BEVS-2
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xa1c02292

Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 488392064 488390017 232.9G 83 Linux

Disk /dev/sdb: 14.96 GiB, 16034824192 bytes, 31318016 sectors
Disk model: GOODRAM 16GB
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x008dbb62

Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 31318015 31315968 15G c W95 FAT32 (LBA)

Disk /dev/zram0: 745.66 MiB, 781864960 bytes, 190885 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/zram1: 745.66 MiB, 781864960 bytes, 190885 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
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jns55
 
There is only one Linux partition occupying the entire disk. Your PC boots in BIOS mode, the first part of the tutorial indicated by Lulu69 is intended for PCs starting in UEFI, so not yours. However, the second part with boot-repair might do the trick.

There is one thing I don't understand: deleting the Windows partition should normally not affect the GRUB booting since it is placed in the MBR of the disk, so outside of any partition, the GRUB config files being located in the Linux partition, everything should be in place. I am very much afraid that the MBR of the disk is corrupted.

How did you go about deleting the Windows partition?
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Francois56 > jns55
 
So I followed the second part of the tutorial indicated by Lulu69 with boot-repair and now I no longer have "No bootable device", it stops at this:
PXE-E61: Media test failure, check cable
PXE-MOF: Exiting Broadcom PXE ROM.
And then nothing...

I deleted the Windows partition via the partition manager on Lubuntu... But I think I messed up, I tinkered too much...
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jns55 > Francois56
 
Apparently the disk has a problem, probably with the MBR.
Try this:
From your installation media, launch GParted.
https://gparted.org/display-doc.php?name=help-manual&lang=en#gparted-create-partition-table

In the Devices menu, select your disk, then right-click: create a new partition table. Select a msdos type table and apply.
This will erase the entire disk, but with a bit of luck, the disk might be fixed.
Once that's done, reinstall Lubuntu using the whole disk (automatic installation).
Keep me updated.
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Réponse 5 / 6
Lulu69 Posted messages 4321 Registration date   Status Membre Last intervention   741
 
Hello,

And why not run the command in a live terminal

sudo grub-install /dev/sdb

Of course, the disks must be unmounted

Secure, save, hold, protect, control.
95% of computer problems are found between the keyboard and the chair.
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Réponse 6 / 6
Francois56
 
Good evening,
I indeed erased the disk via gparted and installed Xubuntu (it didn't work with Lubuntu...).
Everything is working now.
A big thank you for your advice!
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Lulu69 Posted messages 4321 Registration date   Status Membre Last intervention   741
 
Great and best wishes with GNU/Linux :-)
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